R. Harmon's Earth 101 Message Board

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Pastimes : R. Harmon's Earth 101

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To: .Trev who wrote (153)	5/5/2000 10:53:00 PM
From: Lilian Debray	Read Replies (1) of 183

In reference to your comment "I still seem to remember that SO4 is incomplete as a formula and needs some sort of other appendage before it becomes a sulphate.", you might have been thinking of G.N. Lewis' Octet Rule in Thermodynamics and the Free Energy of Chemical Substances (1923) Atoms are most stable if they have a filled or empty outer layer of electrons. Except for H and He, a filled layer contains 8 electrons - an octet, atoms will either gain/ lose (ionic compounds)or share (covalent compounds) electrons to make a filled or empty outer layer. I remember sulphates as a textbook example of a violation of the octet rule. Sulphur form six bonds. Two of the oxygens each donate an electron pair, forming two double bonds with the sulphur. When this happens, the formal charges on those oxygens drop to zero. Same for the formal charge of sulphur: zero. The remaining two oxygens, singly bonded to sulphur, each carry a -1 charge and usually attract metals to have a filled outer layer. chem.ufl.edu Congratulations on your soon to be octet of grandchildren. A lot of awfully good reasons to strategically loose at chess <g>.

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